dual boot – Crash:systemd-journald:failed to write entry. ignoring input/output. systemd-journald:failed to rotate /var/log/journal/ read only file system

I have a Hp laptop, dual boot, running windows 10,and Ubuntu 18.04LTS.
Recently I have been facing issue, that Ubuntu suddenly crashes and shows error of this type Link of the image and another time this type of error link of another image.

I am a newbie and don’t know what is causing this error, still I have a speculation that might be my HDD is causing this, my laptop has become very slow, its 3+ years old and recently ran the SMART Test, the test result was OK, and bad sector count was 25168. Please help.